Exped Sim 3.8

Exped Sim 3.8

3.8 cm self-flowing mattress, for use all year round, perfect for camping and touring.

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The opinion of Aventure Nordique

The Sim 3.8 from Exped is a warm and comfortable self-inflating mattress. It can be used at base camp, in a camper van, in a utility vehicle or to make your loved ones sleep comfortably at home. It has a thickness of 3.8 centimetres.

The mattress is insulated with synthetic foam and is pleasant to the skin and can be used all year round. The mattress has an R-Value of 4.6, calculated with the new ASTM F3340-18 standard, for a comfort temperature down to -15°C. This open cell foam absorbs air when the inflation valve is open. This is what makes the Sim 3.8 self-inflating!

It is equipped with 2 flat valves, one for inflation (air intake) and one for deflation. These valves do not protrude from the mattress, so they do not interfere with the sleeper.

Technical details

Manufacturer Exped
Product name Sim 3.8
Season 4 season
Type Self-inflating
Form Rectangular
R-Value 4.6
    • Insulation: open cell foam, Pu, 14 kg/m³.
    • Top: 75 denier polyester, laminated with TPU Polyether film, with anti-slip coating, hypoallergenic
    • Underneath: 75 denier polyester, TPU Polyether film laminate, with anti-slip coating, hypoallergenic
        Length M : 183 cm - LW : 197 cm
        Width M : 50 cm - LW : 65 cm
        Thickness 3,8 cm
        Folded M : 26 x 18 cm - LW : 33 x 19 cm
        Weight M : 860 g - LW : 11850 g
        Accessories Repair Kit, Pump, Storage bag
        Warranty 5 years
        Country of Manufacture Taiwan


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